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本文以局部奇异性方法为手段,结合证据权模型中点-面空间相关关系显著性指标t值,确定了成矿元素局部奇异值最优的α阈值,据此圈出了单元素异常分布区域。同时采用基于广义自相似性原理的S-A方法对复合异常进行分解,得出区域背景场和异常场的空间分布。研究显示,上述方法圈定的异常区域与已知矿床及区域成矿条件吻合程度较高,能有效地提取和增强元素弱异常,所圈异常区域可靠程度较高,具有找矿意义。
In this paper, by means of the local singularity method, combining with the t value of the significant index of point-plane spatial correlation in the weight of evidence, the optimal α threshold for the local singular value of ore-forming elements is determined, and the single element anomaly distribution area . At the same time, S-A method based on the principle of generalized self-similarity is used to decompose the composite anomalies, and the spatial distribution of the regional background field and the anomalous field is obtained. The study shows that the anomalous zone delineated by the above method is in good agreement with the known ore deposits and regional metallogenic conditions, which can effectively extract and enhance the element weak anomaly, and the anomalous region of the ring is more reliable and has the prospecting significance.